The "Extra Quality" setting in ReShade RTGI 0.3.6.1 is an optional feature that allows for higher quality lighting calculations. When enabled, it increases the accuracy of the global illumination, resulting in:
: Physically simulates light bouncing off objects to provide realistic diffuse and specular lighting. reshade rtgi 0361 extra quality
Place them in your game's reshade-shaders/Shaders and Textures folders. Enable qUINT_rtgi at the top of your shader list. The "Extra Quality" setting in ReShade RTGI 0